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  6. 2024 ICD-10-CM Code S66.5

2024 ICD-10-CM Diagnosis Code S66.5

Injury of intrinsic muscle, fascia and tendon of other and unspecified finger at wrist and hand level

ICD-10-CM Code:
S66.5
ICD-10 Code for:
Inj intrinsic musc/fasc/tend and unsp finger at wrs/hnd lv
Is Billable?
Not Valid for Submission
Code Navigator:

Code Classification

  • Injury, poisoning and certain other consequences of external causes
    (S00–T88)
    • Injuries to the wrist, hand and fingers
      (S60-S69)
      • Injury of muscle, fascia and tendon at wrist and hand level
        (S66)

S66.5 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of injury of intrinsic muscle, fascia and tendon of other and unspecified finger at wrist and hand level. The code is not specific and is NOT valid for the year 2024 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Unspecified diagnosis codes like S66.5 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Specific Coding Applicable to Inj intrinsic musc/fasc/tend and unsp finger at wrs/hnd lv

Non-specific codes like S66.5 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for inj intrinsic musc/fasc/tend and unsp finger at wrs/hnd lv:

  • S66.50 for Unspecified injury of intrinsic muscle, fascia and tendon of other and unspecified finger at wrist and hand level - NON-BILLABLE CODE

  • S66.500 for Unspecified injury of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.500A for initial encounter - BILLABLE CODE

  • Use S66.500D for subsequent encounter - BILLABLE CODE

  • Use S66.500S for sequela - BILLABLE CODE

  • S66.501 for Unspecified injury of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.501A for initial encounter - BILLABLE CODE

  • Use S66.501D for subsequent encounter - BILLABLE CODE

  • Use S66.501S for sequela - BILLABLE CODE

  • S66.502 for Unspecified injury of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.502A for initial encounter - BILLABLE CODE

  • Use S66.502D for subsequent encounter - BILLABLE CODE

  • Use S66.502S for sequela - BILLABLE CODE

  • S66.503 for Unspecified injury of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.503A for initial encounter - BILLABLE CODE

  • Use S66.503D for subsequent encounter - BILLABLE CODE

  • Use S66.503S for sequela - BILLABLE CODE

  • S66.504 for Unspecified injury of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.504A for initial encounter - BILLABLE CODE

  • Use S66.504D for subsequent encounter - BILLABLE CODE

  • Use S66.504S for sequela - BILLABLE CODE

  • S66.505 for Unspecified injury of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.505A for initial encounter - BILLABLE CODE

  • Use S66.505D for subsequent encounter - BILLABLE CODE

  • Use S66.505S for sequela - BILLABLE CODE

  • S66.506 for Unspecified injury of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.506A for initial encounter - BILLABLE CODE

  • Use S66.506D for subsequent encounter - BILLABLE CODE

  • Use S66.506S for sequela - BILLABLE CODE

  • S66.507 for Unspecified injury of intrinsic muscle, fascia and tendon of left little finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.507A for initial encounter - BILLABLE CODE

  • Use S66.507D for subsequent encounter - BILLABLE CODE

  • Use S66.507S for sequela - BILLABLE CODE

  • S66.508 for Unspecified injury of intrinsic muscle, fascia and tendon of other finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.508A for initial encounter - BILLABLE CODE

  • Use S66.508D for subsequent encounter - BILLABLE CODE

  • Use S66.508S for sequela - BILLABLE CODE

  • S66.509 for Unspecified injury of intrinsic muscle, fascia and tendon of unspecified finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.509A for initial encounter - BILLABLE CODE

  • Use S66.509D for subsequent encounter - BILLABLE CODE

  • Use S66.509S for sequela - BILLABLE CODE

  • S66.51 for Strain of intrinsic muscle, fascia and tendon of other and unspecified finger at wrist and hand level - NON-BILLABLE CODE

  • S66.510 for Strain of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.510A for initial encounter - BILLABLE CODE

  • Use S66.510D for subsequent encounter - BILLABLE CODE

  • Use S66.510S for sequela - BILLABLE CODE

  • S66.511 for Strain of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.511A for initial encounter - BILLABLE CODE

  • Use S66.511D for subsequent encounter - BILLABLE CODE

  • Use S66.511S for sequela - BILLABLE CODE

  • S66.512 for Strain of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.512A for initial encounter - BILLABLE CODE

  • Use S66.512D for subsequent encounter - BILLABLE CODE

  • Use S66.512S for sequela - BILLABLE CODE

  • S66.513 for Strain of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.513A for initial encounter - BILLABLE CODE

  • Use S66.513D for subsequent encounter - BILLABLE CODE

  • Use S66.513S for sequela - BILLABLE CODE

  • S66.514 for Strain of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.514A for initial encounter - BILLABLE CODE

  • Use S66.514D for subsequent encounter - BILLABLE CODE

  • Use S66.514S for sequela - BILLABLE CODE

  • S66.515 for Strain of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.515A for initial encounter - BILLABLE CODE

  • Use S66.515D for subsequent encounter - BILLABLE CODE

  • Use S66.515S for sequela - BILLABLE CODE

  • S66.516 for Strain of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.516A for initial encounter - BILLABLE CODE

  • Use S66.516D for subsequent encounter - BILLABLE CODE

  • Use S66.516S for sequela - BILLABLE CODE

  • S66.517 for Strain of intrinsic muscle, fascia and tendon of left little finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.517A for initial encounter - BILLABLE CODE

  • Use S66.517D for subsequent encounter - BILLABLE CODE

  • Use S66.517S for sequela - BILLABLE CODE

  • S66.518 for Strain of intrinsic muscle, fascia and tendon of other finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.518A for initial encounter - BILLABLE CODE

  • Use S66.518D for subsequent encounter - BILLABLE CODE

  • Use S66.518S for sequela - BILLABLE CODE

  • S66.519 for Strain of intrinsic muscle, fascia and tendon of unspecified finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.519A for initial encounter - BILLABLE CODE

  • Use S66.519D for subsequent encounter - BILLABLE CODE

  • Use S66.519S for sequela - BILLABLE CODE

  • S66.52 for Laceration of intrinsic muscle, fascia and tendon of other and unspecified finger at wrist and hand level - NON-BILLABLE CODE

  • S66.520 for Laceration of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.520A for initial encounter - BILLABLE CODE

  • Use S66.520D for subsequent encounter - BILLABLE CODE

  • Use S66.520S for sequela - BILLABLE CODE

  • S66.521 for Laceration of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.521A for initial encounter - BILLABLE CODE

  • Use S66.521D for subsequent encounter - BILLABLE CODE

  • Use S66.521S for sequela - BILLABLE CODE

  • S66.522 for Laceration of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.522A for initial encounter - BILLABLE CODE

  • Use S66.522D for subsequent encounter - BILLABLE CODE

  • Use S66.522S for sequela - BILLABLE CODE

  • S66.523 for Laceration of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.523A for initial encounter - BILLABLE CODE

  • Use S66.523D for subsequent encounter - BILLABLE CODE

  • Use S66.523S for sequela - BILLABLE CODE

  • S66.524 for Laceration of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.524A for initial encounter - BILLABLE CODE

  • Use S66.524D for subsequent encounter - BILLABLE CODE

  • Use S66.524S for sequela - BILLABLE CODE

  • S66.525 for Laceration of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.525A for initial encounter - BILLABLE CODE

  • Use S66.525D for subsequent encounter - BILLABLE CODE

  • Use S66.525S for sequela - BILLABLE CODE

  • S66.526 for Laceration of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.526A for initial encounter - BILLABLE CODE

  • Use S66.526D for subsequent encounter - BILLABLE CODE

  • Use S66.526S for sequela - BILLABLE CODE

  • S66.527 for Laceration of intrinsic muscle, fascia and tendon of left little finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.527A for initial encounter - BILLABLE CODE

  • Use S66.527D for subsequent encounter - BILLABLE CODE

  • Use S66.527S for sequela - BILLABLE CODE

  • S66.528 for Laceration of intrinsic muscle, fascia and tendon of other finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.528A for initial encounter - BILLABLE CODE

  • Use S66.528D for subsequent encounter - BILLABLE CODE

  • Use S66.528S for sequela - BILLABLE CODE

  • S66.529 for Laceration of intrinsic muscle, fascia and tendon of unspecified finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.529A for initial encounter - BILLABLE CODE

  • Use S66.529D for subsequent encounter - BILLABLE CODE

  • Use S66.529S for sequela - BILLABLE CODE

  • S66.59 for Other injury of intrinsic muscle, fascia and tendon of other and unspecified finger at wrist and hand level - NON-BILLABLE CODE

  • S66.590 for Other injury of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.590A for initial encounter - BILLABLE CODE

  • Use S66.590D for subsequent encounter - BILLABLE CODE

  • Use S66.590S for sequela - BILLABLE CODE

  • S66.591 for Other injury of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.591A for initial encounter - BILLABLE CODE

  • Use S66.591D for subsequent encounter - BILLABLE CODE

  • Use S66.591S for sequela - BILLABLE CODE

  • S66.592 for Other injury of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.592A for initial encounter - BILLABLE CODE

  • Use S66.592D for subsequent encounter - BILLABLE CODE

  • Use S66.592S for sequela - BILLABLE CODE

  • S66.593 for Other injury of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.593A for initial encounter - BILLABLE CODE

  • Use S66.593D for subsequent encounter - BILLABLE CODE

  • Use S66.593S for sequela - BILLABLE CODE

  • S66.594 for Other injury of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.594A for initial encounter - BILLABLE CODE

  • Use S66.594D for subsequent encounter - BILLABLE CODE

  • Use S66.594S for sequela - BILLABLE CODE

  • S66.595 for Other injury of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.595A for initial encounter - BILLABLE CODE

  • Use S66.595D for subsequent encounter - BILLABLE CODE

  • Use S66.595S for sequela - BILLABLE CODE

  • S66.596 for Other injury of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.596A for initial encounter - BILLABLE CODE

  • Use S66.596D for subsequent encounter - BILLABLE CODE

  • Use S66.596S for sequela - BILLABLE CODE

  • S66.597 for Other injury of intrinsic muscle, fascia and tendon of left little finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.597A for initial encounter - BILLABLE CODE

  • Use S66.597D for subsequent encounter - BILLABLE CODE

  • Use S66.597S for sequela - BILLABLE CODE

  • S66.598 for Other injury of intrinsic muscle, fascia and tendon of other finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.598A for initial encounter - BILLABLE CODE

  • Use S66.598D for subsequent encounter - BILLABLE CODE

  • Use S66.598S for sequela - BILLABLE CODE

  • S66.599 for Other injury of intrinsic muscle, fascia and tendon of unspecified finger at wrist and hand level - NON-BILLABLE CODE

  • Use S66.599A for initial encounter - BILLABLE CODE

  • Use S66.599D for subsequent encounter - BILLABLE CODE

  • Use S66.599S for sequela - BILLABLE CODE

Coding Guidelines

The appropriate 7th character is to be added to each code from block Injury of muscle, fascia and tendon at wrist and hand level (S66). Use the following options for the aplicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Type 2 Excludes

Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
  • injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level S66.4

Patient Education


Hand Injuries and Disorders

No matter how old you are or what you do for a living, you are always using your hands. When there is something wrong with them, you may not be able to do your regular activities.

Hand problems include :

  • Carpal tunnel syndrome - compression of a nerve as it goes through the wrist, often making your fingers feel numb
  • Injuries that result in fractures (broken bones), ruptured ligaments and dislocations
  • Osteoarthritis - wear-and-tear arthritis, which can also cause deformity
  • Tendinitis - irritation of the tendons
  • Disorders and injuries of your fingers and thumb

[Learn More in MedlinePlus]

Muscle Disorders

Your muscles help you move and help your body work. Different types of muscles have different jobs. There are many problems that can affect muscles. Muscle disorders can cause weakness, pain or even paralysis.

Causes of muscle disorders include:

  • Injury or overuse, such as sprains or strains, cramps or tendinitis
  • A genetic disorder, such as muscular dystrophy
  • Some cancers
  • Inflammation, such as myositis
  • Diseases of nerves that affect muscles
  • Infections
  • Certain medicines

Sometimes the cause of muscle disorders is unknown.


[Learn More in MedlinePlus]

Wrist Injuries and Disorders

Your wrist connects your hand to your forearm. It is not one big joint; it has several small joints. This makes it flexible and allows you to move your hand in different ways. The wrist has two big forearm bones and eight small bones known as carpals. It also has tendons and ligaments, which are connective tissues. Tendons connect muscles to bones. Ligaments connect bones to each other.

What are the types of wrist injuries and disorders?

Some of the more common types of wrist injuries and disorders are:

  • Carpal tunnel syndrome, which happens when a nerve that runs from your forearm into your palm becomes squeezed at the wrist
  • Ganglion cysts, which are noncancerous lumps or masses
  • Gout, which is a form of arthritis caused by a buildup of uric acid in your joints
  • Fractures (broken bones)
  • Osteoarthritis, the most common type of arthritis. It is caused by wear and tear of the joints.
  • Sprains and strains, which are injuries to ligaments and injuries to muscles or tendons
  • Tendinitis, inflammation of a tendon, usually due to overuse

Who is at risk for wrist injuries and disorders?

Certain things can put you at higher risk of having a wrist problem, including:

  • Doing sports, which can put you at risk for injuries and puts stress on your wrist. For example, you may fall on your outstretched hand when you are skating or snowboarding. Your wrist could be injured while doing contact sports. And other sports such as gymnastics and basketball can strain your wrists.
  • Doing repetitive wrist motions, such as typing on a keyboard, working on an assembly line, or using power tools.
  • Having certain diseases. For example, rheumatoid arthritis can cause wrist pain.

What are the symptoms of wrist injuries and disorders?

The symptoms of a wrist problem can vary, depending on the problem. A common symptom is wrist pain. Some other possible symptoms include swelling, a decrease in wrist strength, and sudden numbness or tingling.

How are wrist injuries and disorders diagnosed?

Your health care provider may use many tools to make a diagnosis:

  • A medical history, which includes asking about your symptoms
  • A physical exam, including checking your wrist strength and range of motion
  • An x-ray or other imaging test
  • Blood tests

What are the treatments for wrist injuries and disorders?

Treatments for wrist pain depends on the type of injury or disorder. They may include:

  • Resting your wrist
  • Wearing a wrist brace or cast
  • Pain relievers
  • Cortisone shots
  • Physical therapy
  • Surgery

Can wrist injuries and disorders be prevented?

To try to prevent wrist problems, you can:

  • Use wrist guards, when doing sports that put you at risk for wrist injuries
  • In the workplace, perform stretching exercises and take frequent rest breaks. You should also pay attention to ergonomics to make sure that you are using the proper wrist position while working.
  • Make sure that you get enough calcium and vitamin D to keep your bones strong

[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.